Many conflicting reports have been given in the literature concerning the effect of various factors on the rate of reversal of figure and ground in reversible perspective.
Flugel (7, 8) suggested that changes in eye movement increased the number of...

Close up view of debris, including twisted metal and wood, from the tornado that hit Louisville, Kentucky, on March 27, 1890. Buildings with their facades damaged or completely gone are seen further down the street. The tornado killed an estimated...